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An air conditioner is used to keep the interior of a house at a temperature of 20 C while the outside temperature is 35 C. If heat leaks into the house at the rate of 12 kW, and the air conditioner has the efficiency of a Carnot engine, what is the mechanical power required to keep the house cool?
Suppose the mirror is convex. The distance between the image and the object is the same as in part (a), but the image is 0.500 the size of the object. Determine the focal length of the mirror
You might think that it is never a good approximation to ignore air resistance. However, often it is. How far should you go to reach the treasure in paces
at a certain location the earth has a magnetic ?eld of 8.3 times 10-5 t pointing in the northward direction at 44?
A bolt is dropped from a bridge under construction, falling 92m to the valley below the bridge. (a) How much time does it take to pass through the last 26 percent of its fall? What is its speed (b) when it begins that last 26 percent of its fall a..
coherent light with wavelength 510 nm passes through narrow slits with a separation of 310mm, what is the phase difference (in radians) in the light from the two slits at an angle of 22.0 degrees from the centerline
What total impulse was imparted by these forces. Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.0 cm-3, and their speed is 702 km/s. Find the current density of these protons.
An object, at the top of a very tall building, is released from rest and falls freely due to gravity. Neglect air resistance and compute distance covered by the object between times t1 = 5.5 s and t2 = 7.9 s after it is released.
In coming to a stop, a car leaves skid marks 77m long on the highway. Assuming a deceleration of 8m/s2, estimate the speed of the car just before braking.
An isolated charged conducting sphere of radius 12.0 cm creates an electric field of 4.90 104 N/C at a distance 22.0 cm from its center. What is its surface charge density
The projection lens in a certain slide projector is a single thin lens. A slide 23.6 mm high is to be projected so that its image fills a screen 1.87 m high. Determine the focal length of the projection lens
A beam of neutrons with a de Broglie wavelength of 0.260nm diffracts from a crystal of table salt, which has an interionic spacing of 0.280nm, What is the speed of the neutrons
An object placed 14.9 cm from a concave mirror produces a real image 12.3 cm from the mirror. where is the new image located as measured from the mirror
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